I started fooling around with Saturation and combining it with Level and then Equalize and Level.

Original
wu4

#1
wu4

wu4

#2
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Saturation 200
Saturation 400



Using the Sat 400 image (#2), I added Level to get #3.

#3
wu4
Saturation 400
Level 8/0.2/30000


#4 & #5 I started with Equalize.

#4
wu4

wu4

#5
wu4

Equalize
Level 8/0.4/60000
Saturation 600		Equalize
Level 8/0.4/60000
Saturation 600
Dull twice




I used to think Dull just meant dull, but what I notice is a spreading and sometimes even a mild highlighting of the colors.
I also find dull helpful after using Raises and/or sunken to return a bit of color where the frame created gets too black on one edge and too light on another.